What does the Main 23 fault code mean?

Your boiler is struggling to push water around the system, likely because the water pressure has dropped too low or the pump is stuck.

How much does it cost to fix Main error code 23?

Typical repair cost for the Main 23 fault is £120-250 including labour.

Check the pressure gauge on the front of the boiler; if it is below 1 bar, find the filling loop underneath the boiler.

Fault on Pump or Low System Pressure

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Six most common causes of dropping pressure.

Each noise points to a different fault.

7 signs repair isn't worth it anymore.